MQTT integration taking too long to load (68s atm)


I use the latest HA version and I’ve been trying to figure out why my MQTT integration is taking around 68 seconds to start.
I do use ZWaveJS2MQTT and Zigbee2MQTT and have a total of 112 devices and 656 entities but I can’t see any error in the logs so quite difficult to troubleshoot it this way. Both ZWave and Zigbee are working as intended in a timely manner.
I went through a handful of topics here but none of those actually helped me on this quest.
Is there anything I can do to troubleshoot this properly?

Many thanks!

Managed to get to 53s excluding unknow entities but still too slow I think